CRCU

Chemical Research in Chinese Universities ›› 2010, Vol. 26 ›› Issue (4): 550-553.

• Articles • Previous Articles     Next Articles

Catalytic Synthesis of Methylene Diphenyl Dicarbamate in AcOH/H2O Mixed Solvent

PEI Yi-xia1,2, LI Hui-quan1*, LIU Hai-tao1, ZHANG Qin-hua1,2 and ZHANG Yi1   

  1. 1. Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2009-09-28 Revised:2010-01-22 Online:2010-07-25 Published:2010-10-01
  • Contact: LI Hui-quan. E-mail: hqli@home.ipe.ac.cn
  • Supported by:

    Supported by the Foundation of the Science and Technology Ministry of China(No.2006BAC02A08) and the Knowledge Innovation Fund of Chinese Academy of Sciences(No.KGCX2-YW-215-2).

PDF (PC)

Abstract: In a mixed solvent of acetic acid(AcOH)/water, methylene diphenyl dicarbamate(MDC) was synthesized by the condensation of methyl phenyl carbamate(MPC) and formaldehyde in the presence of an inorganic acid catalyst. Based on the different solubilities to MPC and MDC, the mixed solvent showed higher catalytic performance than pure water. The mixed solvent not only promoted the condensation of MPC but aslo exhibited the advantage of the product separation with the reactants. Under the optimized conditions: a H2SO4 mass fraction of 31%, a reaction temperature of 95 °C and reaction time of 3.5 h, the yield of MDC reached 74.3%. In addition, the recycle of the solvent was also investigated.

Key words: Mixed solvent, Methylene diphenyl dicarbamate, Formaldehyde, Liquid acid